On 2020-12-27 at 02:31, Andrei POPESCU wrote: > On Sb, 26 dec 20, 17:19:32, The Wanderer wrote: > >> With the new GPU in place, I get video output during POST and in >> the BIOS (yes, this machine is old enough that it doesn't have a >> UEFI) without problems. That demonstrates that the GPU isn't dead >> on arrival, and that signal is getting through to the monitor on a >> basic level. > > At this apoint you might want to query your monitor for the > resolution used, might be helpful in case you want to configure grub > with a known working resolution (as per other suggestions).
I know my monitor resolution; it's 2560x1600, and supports many exact-subset lower resolutions. What type of query were you thinking of? The output of xrandr is one possibility, and that of 'get-edid | parse-edid' (with /dev/ mounted exec) is another; the latter is closer to a true "query the monitor", but seems to provide less information. >> However, as soon as the machine tries to hand over control to the >> bootloader, I get a hard freeze; the screen goes black (albeit I >> think still with backlight), the keyboard light toggle keys stop >> responding, and the GRUB menu never appears. Waiting a long time >> doesn't change anything; even after roughly half an hour of >> waiting, pressing the Power button once (no press-and-hold) shuts >> the system off immediately, which indicates that the system hasn't >> progressed much (if at all) past early boot. > > Maybe changing some BIOS setting could help. I already checked, and didn't see any settings that seemed relevant. IIRC I did change an unrelated setting which I noticed along the way. This behavior didn't change afterward. > The suggestion to try a live image is also good. > > As far as I know the Debian Installer is using very basic VGA > graphics, for maximum compatibility, so result might be different > than a full live system. If it can get *anything* after the BIOS handover, it's at least progress from where I currently sit. Validating with those basic minimal graphics is actually a good thing, IMO, although you're right that it only goes so far. -- The Wanderer The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man. -- George Bernard Shaw
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