Created attachment 122688 [details]
On my ASUS Transformer Book T100HA, the built in DSI display fails to display any image right after KMS takes over from efifb. The backlight remains on.
Please see attached for kernel log (drm.debug=0xe).
I am unable to obtain a VBIOS dump. Kernel says:
0:02.0: Invalid PCI ROM header signature: expecting 0xaa55, got 0xe725
Steps to reproduce the issue:
1) Just boot the device.
How often does the steps listed above trigger the issue?
The following information about your system:
-- system architecture: x86-64
-- kernel version: 4.6.0-994-generic (drm-intel-nightly from 2016-04-02)
-- Linux distribution: Ubuntu 15.10
-- Machine or mother board model: ASUS Transformer Book T100HA
-- Display connector: DSI
Interestingly, this allows the display to have an image:
# X &
# DISPLAY=:0 xrandr
Screen 0: minimum 8 x 8, current 800 x 1280, maximum 32767 x 32767
DSI1 connected 800x1280+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
# DISPLAY=:0 xrandr --output DSI1 --off
# DISPLAY=:0 xrandr --output DSI1 --auto
# DISPLAY=:0 xterm
(xterm displays on screen)
email@example.com - I'm really sorry about this delay until getting back to you. Are you still seeing this problem with the latest drm-tip and/or Ubuntu? If this is still valid with the newest kernel please provide new dmesg and check out also card0/error data and attach that if applicable ($ cat /sys/class/drm/card0/error | bz2 > error.bz2).
Or should I assume that this is fixed due to comment 1?
I suspect this may be fixed in either v4.11-rc3 or drm-tip branch of https://cgit.freedesktop.org/drm/drm-tip. Please retest.
due to lack of response from the verification I'm closing this bug as fixed according to last comment. If the issue remains please open a new bug with