Bug 196065
| Summary: | External display pixelated after upgrade to kernel >= 4.11.0-rc1 | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | Neil Kownacki (njkkow) |
| Component: | Console/Framebuffers | Assignee: | James Simmons (jsimmons) |
| Status: | RESOLVED INVALID | ||
| Severity: | normal | ||
| Priority: | P1 | ||
| Hardware: | Intel | ||
| OS: | Linux | ||
| Kernel Version: | 4.11.0-rc1 | Subsystem: | |
| Regression: | Yes | Bisected commit-id: | |
| Attachments: |
dmesg, inxi, Xorg.0.log, fb0 sysfs, EDID
Fedora default config for 4.11.3 and config used for drm-tip 4.12.0-rc4 |
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Created attachment 257007 [details]
Fedora default config for 4.11.3 and config used for drm-tip 4.12.0-rc4
I should add that I built a kernel from cgit.freedesktop.org/drm-tip today and I still see the issue. I unfortunately don't have the configs from the 4.10 and 4.11 kernels that I ran to get the initial logs, but I can redo if necessary. Attached the Fedora config for 4.11.3 and the config I used for building the drm-tip kernel.
Please file drm/i915 bugs at https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel |
Created attachment 256993 [details] dmesg, inxi, Xorg.0.log, fb0 sysfs, EDID I have a Thinkpad X270 with HDMI out and Intel HD Graphics 620, running Fedora 25, Mint, and Xubuntu. I had been using a 26" Vizio E261VA TV as an external monitor for a few months without any issues, but after upgrading to any kernel >= 4.11.0-rc1, the display becomes very pixelated and text is almost unreadable. On 4.10 it looks fine. I did some research, and one thing I noticed was that the "mode" for the fb0 device is now set to "U:1360x768p-0". In the working kernel it's "U:1920x1080p-0" (see attachment.) The native resolution for this TV is 1360x768, which is the resolution I run it at, and the laptop screen is running at 1920x1080. I have tried uninstalling xorg-x11-drv-intel (attached logs are using the modesetting driver) but it didn't make a difference. I have also tried booting the kernel with the parameter video=HDMI-A-2:1920x1080M@60. That will change the framebuffer mode back to what it was in 4.10, but I still can't seem to get the pixelation to go away. I noticed quite a few changes in the logs for 4.11.0-rc1 involving drm/i915, framebuffers, EDID, and HDMI, so I assume this has something to do with that. I'm not 100% sure it involves the framebuffer per se, but the resolution change caught my eye. I see the pixelation before X even starts, while the startup checks are running down the screen. Hopefully this is enough info. Let me know if you need anything else. Thanks!