Fri 04 Apr 2014 05:08:28 PM UTC, original submission:
Here's the problem:
When you try to boot OpenSUSE 13.1/Fedora 20(non tested with other distros) in UEFI mode, the UI and terminal screen will be shifted and corrupted with artifacts, or flashing.
Here are some pics of the shifted screen:
http://s1203.photobucket.com/user/SnakeHaveYou/media/20140322_010242_Night.jpg.html
http://s1203.photobucket.com/user/SnakeHaveYou/media/20140322_010401_Night.jpg.html
And here's a video of the flashing screen (only with Kernel 3.14):
https://www.youtube.com/watch?v=ogcsVK-6q6c
How to reproduce?:
Configuration 1:
- Kernel: 3.14
- Video driver: Open Source Radeon driver
- Bootloader: Grub2-EFI
- Issue: Flashing screen (even on console). Vertical lines. No mouse.
- Workaround: None
Configuration 2:
- Kernel: 3.11 to 3.13
- Video driver: Proprietary Catalyst. Latest beta
- Bootloader: Grub2-EFI
- Issue: Shifted screen. Vertical lines. Mouse on screen (pointer with artifacts)
- Workaround: Suspend and wake up system fix the issue. Will appear again after a restart.
When i can't reproduce it?:
Configuration 3:
- Kernel: 3.11 to 3.13
- Video driver: Open Source Radeon
- Bootloader: Grub2-EFI
- Issue: None
Configuration 4:
- Kernel: 3.11 to 3.13
- Video driver: Proprietary and Open Source
- Bootloader: rEFInd ONLY with GOP enabled
- Issue: None
Configuration 5:
- Kernel: 3.14
- Video driver: Open Source Radeon
- Bootloader: rEFInd ONLY with GOP enabled
- Issue: None
Configuration 6:
- With a non-EFI installation, i can;t reproduce the issue
My workaround is:
Install rEFInd and enable GOP mode in refind.conf. This is the only way i found to fix the issue..
Seems to be that there are some incompatibilities between the 7670m and/or Toshiba laptops with Grub2-EFI video modes.
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