Red Hat Bugzilla – Bug 593046
External displays are blank
Last modified: 2011-06-27 12:26:21 EDT
Created attachment 414616 [details]
dmesg output from booting without external display attached
Description of problem:
When booting a Dell M4400 laptop attached to a docking station with one or two displays attached to the DVI ports on the docking station, the external display(s) and internal laptop LCD are blank. The laptop attached to the docking station without any external displays attached to the docking station boots fine and uses the internal display. After booting without external displays and then attaching an external display to the docking station, the desktop is automatically expanded to include the new display, but the display remains blank.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Attach external display to docking station
2. Turn on power to laptop
3. Display remains blank
Blank external displays
Display as expected
Attached Xorg.0.log files and dmesg outputs for booting without any attached external displays (.nodisplay), attaching an external display after booting and logging in (.adddisplay), and booting with nomodeset and external display attached (.nomodeset).
Created attachment 414617 [details]
Xorg.0.log file from boot without external display attached
Created attachment 414618 [details]
dmesg output from booting without external display attached, then attaching external display
Created attachment 414619 [details]
Xorg.0.log file from boot without external display attached, then attaching external display
Created attachment 414620 [details]
dmesg output from booting with external display attached and nomodeset
Created attachment 414621 [details]
Xorg.0.log file from boot with external display attached and nomodeset
Created attachment 414622 [details]
lspci -vvv output
Created attachment 414624 [details]
Is there any additional information I can provide to help with resolution of this issue? I am using the nvidia proprietary driver as a workaround as the nouveau driver does not function in this multi-display setup.
This is a known issue with certain docking station configurations where it's possible for the dock to have either DP or DVI ports, the cause is currently unknown.
Are you able to test the kernel build at:
http://koji.fedoraproject.org/scratch/bskeggs/task_2276325/ and see if you
notice any improvement?
It's not guaranteed, but it looks like this issue may be the same as something
else I was investigating today.
The kernel build in your link seems to have fixed the problem. I can finally use the dual monitor setup with the docking station. No issues so far. Will this fix be included in Fedora kernels going forward? Thanks for your help.
Thanks for confirming Jim. I'm not sure yet if/when this exact fix will hit a Fedora kernel, it's somewhat unclear as to why this is necessary as of yet, or if this fix will break other configurations. I'm investigating this still.
Hey Jim, are you able to test this new scratch build for me also? It hopefully
fixes the same problem (I don't have the configuration to be able to test), but
in a way that doesn't break other systems.
I installed the kernel packages from the link and the external displays are now blank again. Seems like the fixes in the previous kernels have regressed. Let me know if there are any log files I can provide to help debug.
Ugh, that's frustrating! :)
Would it be possible to get your dmesg (not /var/log/messages, since the debug output won't be logged) from booting with "log_buf_len=1M drm.debug=14 nouveau.reg_debug=0x0200 3"?
It's be good to see that from both scratch builds to compare.
Attached are the requested dmesg outputs. Since the external displays are blank with the 22.214.171.124-147 kernel, I had to capture the dmesg output blind, but it seems like it worked. Let me know if you need anything else.
Created attachment 430354 [details]
dmesg output for 126.96.36.199-137 kernel for which external displays work
Created attachment 430356 [details]
dmesg output for 188.8.131.52-147 kernel for which external displays do not work
Here's another build. Hopefully better luck with this one:
The latest build allows the external displays to work. Everything seems good so far. Thanks.
The fixes are available in kernel-184.108.40.206-11.fc13 (http://koji.fedoraproject.org/koji/buildinfo?buildID=183346)
I've opened https://bugzilla.redhat.com/show_bug.cgi?id=614452 as I'm seeing a problem that sounds related to this and isn't fixed even with that kernel.
The 220.127.116.11-147.2.4.fc13.x86_64 kernel that was recently pushed to the Updates repository seems to have regressed in regards to the dual external monitor being blank issue. Reverting back to the 18.104.22.168-147.fc13.x86_64 kernel fixes the problem.
kernel-22.214.171.124-34.fc13 has been submitted as an update for Fedora 13.
kernel-126.96.36.199-34.fc13 has been pushed to the Fedora 13 testing repository. If problems still persist, please make note of it in this bug report.
If you want to test the update, you can install it with
su -c 'yum --enablerepo=updates-testing update kernel'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/kernel-188.8.131.52-34.fc13
The 184.108.40.206-34.fc13 kernel in updates-testing corrects the issue in 220.127.116.11-147.2.4.fc13 so the external displays are working as expected again. Thanks.
kernel-18.104.22.168-37.fc13 has been submitted as an update for Fedora 13.
kernel-22.214.171.124-37.fc13 has been pushed to the Fedora 13 testing repository. If problems still persist, please make note of it in this bug report.
If you want to test the update, you can install it with
su -c 'yum --enablerepo=updates-testing update kernel'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/kernel-126.96.36.199-37.fc13
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