https://bugzilla.suse.com/show_bug.cgi?id=1225296 Bug ID: 1225296 Summary: Dual monitor not recognised after upgrade 15.5 to 15.6 Classification: openSUSE Product: openSUSE Distribution Version: Leap 15.6 Hardware: x86 OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: Installation Assignee: yast2-maintainers@suse.de Reporter: martin.schmidt@io-warnemuende.de QA Contact: jsrain@suse.com Target Milestone: --- Found By: --- Blocker: --- Moin, moin, I am using openSUSE 15.5 on an old intel based x86 PC, equipped with a simple nvidia gforce and two monitors. The monitors are using a displayport connnection from the graphics card to the monitors via an Y-shaped cable. Both monitors are recognised correctly and can be configured to form a single graphical work space, when the system is up and running. After upgrading to openSUSE 15.6 this does not work any more. When booting, monitor 1 shows some firmware screen and the openSUSE boot screen, where the OS version (several subversions of 15.6 and frozen snapshots of 15.5) can be selected. Using the default option (15.6 from harddrive), the output of the boot process is moving to monitor 2, but monitor 1 is going to a "power saving sleep mode" and stays inactive frome here on. The boot process is finished correctly with monitor 2 as the only graphical device. Monitor 1 cannot be activated again. Switching off monitor 2 before booting, the system comes up without any valid output device. Monitor 1 goes to sleep after the system boot started. I did not check the system status with a remote ssh-connection yet. Switching off monitor 1 before booting, lets the system come up completely with monitor 2. Also the initial hardware screen is diplayerd there. In turn, booting from a read-only snapshot with openSUSE 15.5, both monitors are used as before. The nouveau-dri drivers are used, no propriatary nvidia driver is installed. Some upgrade history: - just to test, if the few graphic card cores could be used in a cuda environment, cuda was installed under 15.5. This failed and cuda was deinstalled. However, when upgrading later from 15.5 to 15.6 the cuda development environment was reinstalled automatically together with nvidia drivers. As a result the nvidia drivers allowed only for a single low resolution vga monitor. May be, this happened, since the nvidia repository was not deleted and there was some leftover from the cuda test. - with the ascii-yast the nvidia drivers (gforce003/004) and cuda could be removed and the nouveau-dri drivers where reinstalled - together with dependencies. This allows for a single monitor OS_15.6 system with high resolution, but the second monitor (monitor 1) is lost during the boot process as described above. Before I try to install from scratch just with the hope that the error goes away, I am reporting this strange behaviour here. May be, this helps to streamline the distribution. Any hints are very welcome - especially how to modify the bootloader options. Cheers, Martin Schmidt -- You are receiving this mail because: You are on the CC list for the bug.