Lenovo x120e resume regression in 3.15-rc1 bisected to 'drm/crtc-helpers: fix dpms on logic'
I've bisected a resume regression on a Lenovo x120e to 177cf92de4aa97ec1435987e91696ed8b5023130 (drm/crtc-helpers: fix dpms on logic). Everything works fine with this patch reverted on top of 3.15-rc3. I realize it is correcting a coding error that has been in place since 3.11, but it is also causing this laptop to resume to a black screen wherein the platform appears to be locked up (no console, no network). See attached bisect log and lspci. The BIOS version is 1.15.
rtg
On Fri, May 2, 2014 at 12:40 PM, Tim Gardner tim.gardner@canonical.com wrote:
I've bisected a resume regression on a Lenovo x120e to 177cf92de4aa97ec1435987e91696ed8b5023130 (drm/crtc-helpers: fix dpms on logic). Everything works fine with this patch reverted on top of 3.15-rc3. I realize it is correcting a coding error that has been in place since 3.11, but it is also causing this laptop to resume to a black screen wherein the platform appears to be locked up (no console, no network). See attached bisect log and lspci. The BIOS version is 1.15.
Does the attached patch help? I haven't had a chance to unwind all the logic in the crtc helper code.
Alex
On 05/02/2014 11:21 AM, Alex Deucher wrote:
On Fri, May 2, 2014 at 12:40 PM, Tim Gardner tim.gardner@canonical.com wrote:
I've bisected a resume regression on a Lenovo x120e to 177cf92de4aa97ec1435987e91696ed8b5023130 (drm/crtc-helpers: fix dpms on logic). Everything works fine with this patch reverted on top of 3.15-rc3. I realize it is correcting a coding error that has been in place since 3.11, but it is also causing this laptop to resume to a black screen wherein the platform appears to be locked up (no console, no network). See attached bisect log and lspci. The BIOS version is 1.15.
Does the attached patch help? I haven't had a chance to unwind all the logic in the crtc helper code.
Alex
Nope, same symptom. Black screen on resume, no network, etc.
rtg
On 05/02/2014 12:30 PM, Tim Gardner wrote:
On 05/02/2014 11:21 AM, Alex Deucher wrote:
On Fri, May 2, 2014 at 12:40 PM, Tim Gardner tim.gardner@canonical.com wrote:
I've bisected a resume regression on a Lenovo x120e to 177cf92de4aa97ec1435987e91696ed8b5023130 (drm/crtc-helpers: fix dpms on logic). Everything works fine with this patch reverted on top of 3.15-rc3. I realize it is correcting a coding error that has been in place since 3.11, but it is also causing this laptop to resume to a black screen wherein the platform appears to be locked up (no console, no network). See attached bisect log and lspci. The BIOS version is 1.15.
Does the attached patch help? I haven't had a chance to unwind all the logic in the crtc helper code.
Alex
Nope, same symptom. Black screen on resume, no network, etc.
rtg
linux-next tip (20140502) appears to have the same bug.
rtg
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