On Wed, 2024-05-08 at 11:08 +0100, John Pilkington wrote: > It occurs to me that my new 'dual-boot' problems with F40 KDE might be > related to this, but I'm not clear how I could test it. I've posted > both here and on the kde list. > > I have two screen-devices, HDMI tv and vga monitor. By default booting > is to Windows, but 'escape' early on goes to an HP-provided > boot-selection sequence and grub. > > Choosing "modesetting" starts booting with both screens active, but > freezes shortly after a cursor appears. > > "nomodeset" gives a usable system, but with the vga screen never active > and final HDMI resolution fixed at 800x600. > > Could this perhaps be a conflict of hostnames set at power-on and by Fedora? I wouldn't have thought so (re DNS, IPs, & DHCP). Video output (other than networked KVM kind of things) is direct hardware to monitor, no network should be involved. I don't recall you mentioning KVM, though could have forgotten. Normally, screen set up is long before networking starts. Manual modesetting overrides the OS automatically picking a graphics mode, to some degree. Normally a monitor identifies itself, and the graphics system works out a list of compatible modes that the monitor and the graphics card can both use, and picks the highest resolution possible with the fastest refresh rate. If you have a monitor that doesn't identify itself, or doesn't do it properly (and some don't), or your graphic card is just as bad at it, than manual overrides is the way to go. I seem to remember it was Tom Horsley who had a website page detailing his battles with such things. Hardware KVMs can have the same problems with display ID data, they may have a broken implementation of it. Or only support one mode. Or, alternatively, they could be a solution, forcing a mode that works for you. If you simply prefer a different graphics mode (different scan/refresh rates, different resolutions), then that should be possible to select after you've booted up with the display settings. 800 by 600 is a bit nasty. While it may produce a screen size that some people want, many GUIs expect bigger screen dimensions and don't fit, or you're left with a looking-through-a-keyhole view of them. This EDID info is sent over different wires (DDC) in the video connector than the picture signal. It is possible to have broken pins in the plugs or sockets, or wiring in the cable, that stops this info. If the cable can be completely unplugged from monitor *and* PC, it may be worth trying another. And sometimes a clean toothbrush scrub of the connector contacts fixes problems up. -- NB: All unexpected mail to my mailbox is automatically deleted. I will only get to see the messages that are posted to the list. The following system info data is generated fresh for each post: uname -rsvp Linux 6.2.15-100.fc36.x86_64 #1 SMP PREEMPT_DYNAMIC Thu May 11 16:51:53 UTC 2023 x86_64 -- _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
