[Bug 68451] [regression] Baytrail/T video no longer works on ASUS T100TA

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=68451

--- Comment #5 from Alan <alan at lxorguk.ukuu.org.uk> ---
Yes.. although it is of course possible that the efi frame buffer before hand
means that the VGA= is simply getting the right clocks generated so it happens
to work.

No changes btw if I try drm-intel-fixes

I see nothing in windows that will tell me the panel type either

xrandr on 3.11 shows it as on vga, and turning off vga turns it off, while
turning on vga turns it back on. Changing the mode messes up the display,
restoring the mode gets the display back

(ports shown are VGA1, HDMI1 (not connected), DP1 (not connected), VIRTUAL1
(not connected)

If I try and add the mode to the DP port then enable it I get a crtc configure
failed and a backtrace from intel_dp_max_link_bw (3.11 or drm-intel-fixes)

Interestingly while video=VGA-1:blah fails with 13-rc7(drm-intel-fixes) the
following does produce output on the panel. Is the bug in fact breakage of
video= handling, and the rest is just usually concealed ?

xrandr --newmode 1368x768 {blah}
xrandr --addmode VGA1 1368x768
xrandr --output VGA1 1368x768

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