Red Hat Bugzilla – Bug 842412
[GMA X/Ironlake/Sandy Bridge] External display fails to turn on when plugged in via DP-to-DVI-D (dual link) adapter while laptop is suspended
Last modified: 2013-07-31 13:48:29 EDT
Created attachment 599848 [details]
This occurs whether or not the laptop is docked. So far I've reproduced the bug on the following devices: Lenovo Thinkpad X200 (GM45); X201, T510 (Ironlake); and T420s (Sandy Bridge).
Version-Release number of selected component (if applicable):
Consistently; it happens 100% of the time.
Steps to Reproduce:
1. Suspend laptop.
2. Plug in external display via DisplayPort-to-DVI-D (dual link) adapter.
3. Resume laptop.
- idiot light blinks on monitor
- monitor doesn't turn on
- [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
- monitor works
This bug also occurs when suspending the laptop on a docking station, undocking it, plugging in the display, and resuming. *BUT*, suspending while not docked, docking, plugging in the display, and then resuming does seem to work.
Created attachment 599849 [details]
Fedora Bugzappers volunteer triage team
*** Bug 846176 has been marked as a duplicate of this bug. ***
Possible duplicate of my own bug, filed upstream here:
This is a DRM/kernel bug, not an xorg-x11-drv-intel bug (see "[drm:intel_dp_i2c_aux_ch]")
I'm seeing the same issue on a fully-up-to-date x86_64 F18 install. Adding myself to the CC, will see if I can help out with the upstream bug as well.
I'm using the Accell B087B-007B adapter:
If you can get graphics at all, a useful workaround (not sure where I copied this from):
xrandr --newmode '2560x1440_0.0' 241.50 2560 2608 2640 2720 1440 1443 1448 1481 +hsync -vsync
xrandr --addmode DP1 '2560x1440_0.0'
Numbers were derived by plugging directly into the DisplayPort input on my monitor (Dell U2713HM), in which case things worked fine. (I prefer DVI-D so I can use it with my KVM switch...)
Let me know if I can pull any more info for you.
Hm. I do have another adapter I can try it with, although I might have to find a full-size-to-mini adapter first. (I had a similar adaptor for my MacBook Pro, but it was so flaky that I couldn't stand to use it...)
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