I've acquired a couple of HP L1750 monitors, which have VGA & DVI inputs. The
VGA inputs work without issue. However, the DVI input only works until Kernel
Mode Setting (KMS) occurs, after which it declares it isn't receiving a signal
and enters sleep mode. I've tested two different HP L1750 monitors, with
different DVI cables and different DVI source providers (i.e. different video
cards) and the same behaviour obtains.
I've also tried manually specifying the appropriate resolution via a kernel
boot option, e.g.:
video=DVI-D-0:1280x1024@60e
As well as manually configuring xorg.conf (relying on the the output of `hwinfo
--monitor`) to:
--8<---------------cut here---------------start------------->8---
Section "Device"
Identifier "DefaultDevice"
EndSection
Section "Monitor"
Identifier "DefaultMonitor"
HorizSync 24-83
VertRefresh 50-77
Option "TargetRefreshRate" "60"
Option "DDC" "off"
Option "DPMS" "off"
Option "DefaultModes" "on"
Option "PreferredMode" "1280x1024"
EndSection
Section "Screen"
Identifier "DefaultScreen"
Device "DefaultDevice"
Monitor "DefaultMonitor"
EndSection
--8<---------------cut here---------------end--------------->8---
The issue seems to be[1] that the DVI of this monitor is defective without a
special Windows driver[2] to fix it.
How do I determine what the appropriate EDID should be? And how do I go about
loading it into RAM after boot?
[1]
https://www.linuxquestions.org/questions/linux-hardware-18/second-monitor-connected-as-dvi-enters-sleep-mode-during-boot-and-never-comes-out-of-sleep-%3B-but-works-with-vga-connection-4175654157
[2]
https://answers.microsoft.com/en-us/windows/forum/windows_7-performance/display-problem-with-external-monitor-hp-l1750/7df57883-4777-49a3-a356-72aa4efa79e2
--
Benjamin Slade - https://babbagefiles.xyz
`(pgp_fp: ,(21BA 2AE1 28F6 DF36 110A 0E9C A320 BBE8 2B52 EE19))
'(sent by mu4e on Emacs running under GNU/Linux . https://gnu.org )
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