Split screen on an ultrawide should be simple: you enable a picture-by-picture (PBP) or picture-in-picture (PiP) mode in the monitor’s own menu, plug in a second source, and the display divides the panel into two or more sections. When it stops working, the symptom is usually one of these — the PBP option in the monitor’s on-screen display (OSD) menu is grayed out entirely, the second input shows a “no signal” message even though the device is clearly powered on, the split appears but one side is stretched or letterboxed, or the screen flickers and drops one source after a few seconds. Some monitors also refuse to enable PBP when the main source is running at an unsupported refresh rate, which makes the failure look random.
This is annoying but rarely urgent. Nothing here typically causes data loss or hardware damage — the worst outcome is that you have to toggle inputs manually or work on a single window at a time until it’s resolved. That said, if you rely on split screen for a second PC, a console, or a work laptop docked to the same panel, it’s worth an hour of troubleshooting. Most cases in 2026 come down to input bandwidth limits, HDCP handshakes, or firmware quirks, and the fixes below are ordered from a two-minute menu check to a full driver and cable overhaul.
Likely Causes
| Cause | How to confirm | Fix difficulty |
|---|---|---|
| Wrong or missing second input connection | Check which HDMI/DisplayPort/USB-C ports the PBP mode supports — most monitors only split between specific pairs listed in the manual | Easy |
| PBP blocked by high refresh rate on the primary source | Open Windows Settings > System > Display > Advanced display and look at the current refresh rate; compare it to the monitor’s PBP-supported rate list | Easy |
| OSD option grayed out due to HDCP handshake failure | The second input shows a black screen or “no signal” while the source device works on another display | Easy |
| Outdated monitor firmware | Check the manufacturer’s support page for your model number (printed on the back of the panel) and compare to the version shown in the OSD’s System or Information menu | Moderate |
| Cable or adapter bandwidth limitation | The split mode drops signal when switching to high-resolution or high-refresh sources, or works with one cable but not another | Moderate |
| Graphics driver or GPU output issue | The second PC or laptop’s display settings don’t detect the monitor at all, or output resolution defaults to a low fallback mode | Moderate to hard |
Fix 1: Verify Your Input Pairing Matches PBP Requirements
What causes it
Most ultrawide monitors can’t split between any two arbitrary inputs. Manufacturers restrict PBP to specific port combinations — commonly HDMI 1 with DisplayPort 1, or HDMI 1 with HDMI 2 — to keep the display’s internal scaling hardware within its bandwidth budget. If you plug both sources into ports that can’t be combined, the PBP option simply won’t appear or will be locked.
How to check
Look at the back of the monitor and note which ports your two sources use. Then open the monitor’s OSD (usually the joystick or the second button from the bottom on the right bezel), navigate to Input or PBP/PiP, and see which combinations are offered. Cross-reference with the manual — search “[your model number] PBP supported inputs” if you don’t have the printed copy.
What to do
Move one or both cables to the port pair your model supports. For example, on many LG UltraGear and Samsung Odyssey models, PBP requires one source on HDMI and one on DisplayPort; two HDMI sources won’t split on some older panels, though most 2026-era units allow HDMI-to-HDMI splits.
How to undo it
Move the cables back to their original ports. No settings change is required.
Fix 2: Lower the Primary Source’s Refresh Rate Before Enabling PBP
What causes it
When the monitor runs at its maximum refresh rate (typically 144 Hz, 165 Hz, or 240 Hz on ultrawides), the panel’s bandwidth is fully consumed by the primary source. Many models disable PBP entirely above a threshold — often 60 Hz or 100 Hz on the main input — because they can’t composite two signals at full speed.
How to check
On Windows, right-click the desktop and choose Display settings, scroll down to Advanced display, and look at the refresh rate listed under Display information. If it shows your panel’s maximum (e.g., 165 Hz), PBP is likely locked. Check your monitor’s manual for the exact PBP refresh-rate cap — it’s usually 60 Hz, sometimes 100 Hz.
What to do
On the same Advanced display page, click “Display adapter properties for Display 1,” go to the “Monitor” tab, open the “Screen refresh rate” dropdown, and pick the PBP-supported rate (usually 60 Hz). Then reopen the OSD and enable PBP. On macOS, go to System Settings > Displays and hold the Option key while clicking “Scaled” to expose lower refresh options on supported GPUs.
How to undo it
Disable PBP in the OSD first, then raise the refresh rate back to your preferred value in the same Windows menu. Re-enabling PBP afterward will force the cap again.
Fix 3: Power-Cycle Both Sources and the Monitor to Clear HDCP Handshake Issues
What causes it
High-bandwidth Digital Content Protection (HDCP) requires the source and display to agree on encryption before video passes through. When the handshake fails — often after a monitor sleeps, a cable is hot-swapped, or a console/laptop resumes from sleep — the second input shows black or “no signal,” and PBP can’t lock onto it.
How to check
Switch the monitor fully to the problem input using the OSD’s Input menu. If it stays black while the source device is clearly running (confirmed by plugging that device into another screen or hearing system audio), you likely have a handshake stall rather than a dead cable.
What to do
Shut down both source devices completely (not sleep — full shutdown). Power off the monitor with its physical switch or unplug it from the wall for 30 seconds. Unplug the video cable from both ends. Plug everything back in, power the monitor on first, then boot the sources one at a time — the primary first, then the secondary.
How to undo it
Nothing to undo — this is a reset, not a persistent change.
Fix 4: Replace or Re-Seat the Cable (Bandwidth and Compatibility)
What causes it
Ultrawide resolutions like 3440×1440 at 100 Hz+ or 5120×2160 at 120 Hz+ demand significant bandwidth. An older HDMI cable rated only for HDMI 1.4, a passive USB-C-to-HDMI adapter that can’t carry DisplayPort Alt Mode, or a cable with a loose connector will produce intermittent signal drops, black screens on one side of the split, or resolution fallback to 1080p.
How to check
Look at the cable’s printed markings. DisplayPort cables should be certified for HBR3 (or HBR2 at minimum for 3440×1440 above 100 Hz). HDMI cables should be labeled “Premium High Speed” (HDMI 2.0) or “Ultra High Speed” (HDMI 2.1). If the cable is unmarked and came bundled with a budget accessory, it’s a suspect. Also check for physical damage and confirm both ends are fully seated — a partially inserted DisplayPort connector is a common culprit.
What to do
Swap in a known-good cable: for DisplayPort, a VESA-certified HBR3 cable; for HDMI, an Ultra High Speed certified cable (these carry a QR certification label on the packaging). If you’re using USB-C from a laptop, confirm the cable supports DisplayPort Alt Mode and video output — many USB-C cables are charge-only. Aim for cable runs under 2 meters (about 6.5 feet) without an active extender.
How to undo it
Swap the original cable back in. No software or settings changes involved.
Fix 5: Update the Monitor’s Firmware
What causes it
Manufacturers regularly ship firmware updates that fix PBP bugs — grayed-out OSD options, source-swap failures, and input-drop issues are common changelog entries. If your unit left the factory with an early firmware build, a known bug may be the whole problem.
How to check
In the OSD, go to System, Setup, or Information (the menu name varies by brand) and look for a “Firmware Version” entry. Write it down. Then search the manufacturer’s support site for your exact model number — check the sticker on the back of the panel, not the retail box, since regional variants can differ — and compare against the latest version listed under Downloads or Firmware.
What to do
Download the firmware package from the manufacturer’s site and follow their instructions — usually either a Windows utility (Samsung’s “Samsung Firmware Update” tool, LG’s “OnScreen Control” paired with the Monitor Assistant, Dell’s “Firmware Update Utility”) or a file copied to a FAT32-formatted USB stick that you plug into the monitor’s service port and trigger from the OSD. Do not power off the monitor during the update; a few minutes is typical, and interrupting it can brick the panel’s controller board.
How to undo it
Downgrades are rarely supported. If the new firmware causes problems, check the support page for an archived older version, but be prepared to live with it or contact the manufacturer’s support line.
Fix 6: Update or Reinstall Your Graphics Driver
What causes it
While PBP is handled entirely by the monitor, the source device’s GPU has to output a signal the monitor can accept. A stale or corrupted driver can cause the second PC or laptop to output at an unsupported resolution/refresh combination, fail HDCP negotiation, or not detect the monitor’s second input at all.
How to check
On Windows, press Win + X and choose Device Manager, expand Display adapters, right-click your GPU, and choose Properties > Driver tab to see the version and date. If it’s more than a year old, or if you recently upgraded Windows and split screen stopped working around the same time, this is worth doing.
What to do
For NVIDIA, download the latest Game Ready or Studio driver from the official site and choose “Custom installation” with “Perform a clean installation” checked. For AMD, use the AMD Software Adrenalin installer’s “Factory reset” option during install. For Intel integrated graphics, use the Intel Driver & Support Assistant. Alternatively, use Display Driver Uninstaller (DDU) in Windows Safe Mode to fully remove the old driver before installing fresh. Reboot and test PBP again.
How to undo it
Roll back via Device Manager > Display adapters > Properties > Driver tab > “Roll Back Driver” if the option is available, or install an older driver version downloaded from the GPU vendor’s archive page.
Fix 7: Adjust Scaling and Aspect Ratio Settings on the Secondary Source
What causes it
When PBP works but one side looks stretched, cropped, or letterboxed, the monitor is scaling a mismatched aspect ratio. A 16:9 source squeezed into a narrow half of a 21:9 panel will look distorted unless the monitor is told to preserve the source ratio or the source outputs a matching resolution.
How to check
In the OSD, look under Picture, Aspect Ratio, or PBP settings for options like “Wide,” “Original,” “1:1,” or “Aspect.” Note the current selection. Also check what resolution the secondary source is outputting — on Windows, Settings > System > Display > Display resolution.
What to do
Set the monitor’s aspect mode to “Original” or “Aspect” (not “Wide” or “Fill”) so the source’s native ratio is preserved with black bars rather than stretched. Better yet, set the secondary source’s output resolution to match the split region — for example, 1720×1440 per side on a 3440×1440 ultrawide in 50/50 PBP, or 1920×1080 if the monitor’s scaler prefers standard ratios. Test both approaches and keep the one that looks cleanest.
How to undo it
Set the aspect ratio back to “Wide” in the OSD, or restore the source’s original resolution.
Fix 8: Reset the Monitor to Factory Defaults
What causes it
A misconfigured OSD setting — a stuck “Game Mode,” a disabled input, a saved PBP layout that conflicts with current hardware, or an adaptive-sync setting interfering with multi-source compositing — can prevent PBP from engaging. A factory reset clears all of these at once.
How to check
If you’ve spent time tweaking OSD settings (overclocking refresh rate, toggling FreeSync/G-Sync, changing response time modes) and PBP stopped working afterward, a stuck setting is a likely cause. There’s no definitive diagnostic — this fix is worth trying when simpler steps haven’t helped.
What to do
In the OSD, go to System, Setup, or General (menu naming varies by brand) and choose “Reset,” “Factory Reset,” or “Reset All Settings.” Confirm. The monitor will briefly go black and return to defaults. Reconfigure your brightness, contrast, and picture mode, then re-enable PBP.
How to undo it
Manually restore your preferred OSD settings, or re-import a settings profile if your monitor’s companion software (like LG OnScreen Control or Dell Display Manager) saved one.
If Nothing Works
If you’ve verified input pairing, cleared the HDCP handshake, tested a certified cable, updated firmware and GPU drivers, and reset the monitor without success, the issue is likely hardware: a failing input scaler on the monitor’s mainboard, a damaged port, or a panel controller that no longer supports multi-source compositing. At this point, contact the manufacturer’s support line with your model number, serial number (on the back label), and current firmware version — PBP failures within the warranty period are generally covered as a board-level defect and may qualify for a replacement unit. If you’re out of warranty, a workaround worth considering is a software-based alternative: Windows 11’s built-in Snap Layouts (hover over the maximize button), PowerToys FancyZones, or third-party tools like DisplayFusion can recreate a split-screen workspace on a single source, and a budget KVM switch can handle the second device.
FAQ
Why is the PBP option grayed out in my monitor’s menu?
The three most common reasons are: your primary source is running above the PBP refresh-rate cap (usually 60 Hz or 100 Hz — lower it in Windows’ Advanced display settings), your two inputs aren’t in a supported pairing for your model (check the manual), or the second source isn’t outputting a valid signal for the monitor to lock onto. Fix the first two first — they take under a minute each.
Can I use split screen with two different PCs at different resolutions?
Yes, in most cases. The monitor will scale each source to fit its half of the panel, though mismatched aspect ratios can look stretched. Set both sources to the same aspect ratio where possible — for example, two 16:9 outputs at 1920×1080 or 1720×1440 on a 3440×1440 ultrawide in 50/50 mode — for the cleanest result.
Does split screen work with consoles like the PS5 or Xbox Series X?
Usually yes, as long as the console is on a supported port pairing and the monitor’s PBP mode accepts the console’s 4K or 1440p signal. Note that many ultrawides can’t display a console’s 16:9 output edge-to-edge in PBP, so you’ll see black bars on the console’s half. HDR on consoles sometimes conflicts with PBP; disable HDR on the console if the split won’t engage.
Will using PBP mode reduce my refresh rate permanently?
No — the cap only applies while PBP is active. Once you disable split screen in the OSD, you can restore your monitor’s full refresh rate in Windows’ display settings. Think of it as a temporary bandwidth trade-off, not a change to the panel’s capability.
