[Bug 68651] [hsw edp] KMS+Intel 9600M on Toshiba C75 A 13Q has discolored lines and flashing

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=68651

Edward M. Grant <bugzilla at edwardmgrant.com> changed:

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--- Comment #37 from Edward M. Grant <bugzilla at edwardmgrant.com> ---
I'm seeing something similar on my Toshiba L70-A-04g. There seem to be three
different ways that it fails:

1. Colours are offset by a pixel or so, giving blurry coloured edges around
text.
2. Colours are just wrong, as though the RGB byte order has been swapped or one
of them isn't being displayed at all. The login screen that usually has a lot
of brown shows up largely green.
3. While booting, I get green lines flashing down the screen. The login screen
is OK. When switching to the desktop, I get the green lines again and half a
ghost cursor offset a few hundred pixels from the real one. Then the desktop is
OK except for flashing pixels on the top line.

VESA works pretty well, except if I use lockscreen and log back in, I get
occasional flashing black lines across the screen.

This is on Linux Mint 16 (3.11 kernel), but I just tried the Ubuntu 14.04 beta
(3.13 kernel), and pretty much the same thing happens.

Clearly it is possible to get a solid display on the LCD because the VESA
driver manages it, but the HD 4600 driver can't.

BTW, I'm booting this machine in legacy BIOS mode, not EFI. I could live with
VESA mode even though video playback sucks, but not when I get flashing lines
there after using lockscreen.

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