External monitor resolution not detected

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kyuzo
Posts: 6
Joined: 2014/07/10 08:08:00

External monitor resolution not detected

Post by kyuzo » 2014/07/31 07:35:18

Hi,

I'm experiecing a very annoying issue with CentOS 7. It seems not to be able to detect the external monitor resolition correctly. Now, it does it sometimes, but other times it just gets stuck and says unknown monitor and goes back to a very low resolution. I can see this in my dmesg output:

Code: Select all

[98316.847760] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.852893] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.858045] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.863199] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.868336] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.873467] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.878577] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.883684] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.888751] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.896579] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.901625] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.906717] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.911848] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.916963] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.922087] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.927238] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.932366] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.937501] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
[98316.942632] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
I am using an HP 840 laptop. lspci output:

Code: Select all

# lspci 
00:00.0 Host bridge: Intel Corporation Haswell-ULT DRAM Controller (rev 0b)
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)
00:03.0 Audio device: Intel Corporation Haswell-ULT HD Audio Controller (rev 0b)
00:14.0 USB controller: Intel Corporation Lynx Point-LP USB xHCI HC (rev 04)
00:16.0 Communication controller: Intel Corporation Lynx Point-LP HECI #0 (rev 04)
00:16.3 Serial controller: Intel Corporation Lynx Point-LP HECI KT (rev 04)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection I218-LM (rev 04)
00:1b.0 Audio device: Intel Corporation Lynx Point-LP HD Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation Lynx Point-LP PCI Express Root Port 1 (rev e4)
00:1c.3 PCI bridge: Intel Corporation Lynx Point-LP PCI Express Root Port 4 (rev e4)
00:1c.4 PCI bridge: Intel Corporation Lynx Point-LP PCI Express Root Port 5 (rev e4)
00:1c.5 PCI bridge: Intel Corporation Lynx Point-LP PCI Express Root Port 6 (rev e4)
00:1d.0 USB controller: Intel Corporation Lynx Point-LP USB EHCI #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation Lynx Point-LP LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation Lynx Point-LP SATA Controller 1 [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation Lynx Point-LP SMBus Controller (rev 04)
02:00.0 Network controller: Intel Corporation Wireless 7260 (rev 73)
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mars [Radeon HD 8730M]
03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde/Pitcairn HDMI Audio [Radeon HD 7700/7800 Series]
04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader (rev 01)
The external monitor is a DELL monitor, model u2412mb.

Any help is welcome, as the inability to detect correct external monitor resolution basically makes CentOS utterly unsable for me at the moment, which is a shame and major brawback.

Regards.

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TrevorH
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Re: External monitor resolution not detected

Post by TrevorH » 2014/07/31 08:22:54

I searched google and found one hit from an Ubuntu user with a laptop with the same problem who said that closing and reopening the lid fixed it for them. Also are you using a DP->DVI adapter? If sot hen perhaps this longwinded and ultimately unresolved bug report might be applicable? https://bugs.freedesktop.org/show_bug.cgi?id=56834
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