USB-C port was Aging Dell monitor (U3011)
On Sat, Mar 10, 2018 at 12:02 PM D. Hugh Redelmeier via talk <talk@gtalug.org> wrote:
According to <http://www.dell.com/ed/business/p/dell-u3011/pd> the monitor has
DisplayPort, audio connectors (supports 5.1 channel audio connection), two HDMI 1.3 and two DVI-D connectors with High-Bandwidth Digital Copy Protection (HDCP).
So the right way of connecting to a T450 should be DisplayPort to DisplayPort.
I've switched out the ThinkPad for a T480, which has *no* DisplayPort connector but brings back HDMI (lower resolution with the Dell monitor) and forces me to spend seventy bucks on a new cable (USB-C to DisplayPort). After the screen blanks, the monitor refuses to wake up. Sometimes, corrupt images (very gradually) appear in bands. When the monitor is asleep, Fedora thinks it's still there and leaves open windows on it, completely inaccessible. Powering it off and on does nothing, and it needs to be unplugged/reconnected. Am I missing a BIOS setting? (There were many that needed to be set initially.) Is this a driver problem or should I file a bug? Happens on Xorg and Wayland. Mike
Coincidental and potentially related blog post: https://christian.kellner.me/2018/10/24/thunderbolt-port-guide-t480s-force-p...
Solution (for now): set BIOS Thunderbolt Security setting to DisplayPort. Carry on.
One possible solution (which you may not need anymore, but I thought I'd throw it out there) is to run xrandr or arandr to switch off the monitor. This would bring all the windows back onto the primary monitor. You could then try using [xa]randr to turn the monitor back on, which might "refresh" the monitor. All guesses. Hope this helps. On Wed, 24 Oct 2018 at 21:00, Michael Hill via talk <talk@gtalug.org> wrote:
Solution (for now): set BIOS Thunderbolt Security setting to DisplayPort.
Carry on. --- Talk Mailing List talk@gtalug.org https://gtalug.org/mailman/listinfo/talk
-- Giles https://www.gilesorr.com/ gilesorr@gmail.com
On Mon, Oct 29, 2018 at 3:38 PM Giles Orr via talk <talk@gtalug.org> wrote:
One possible solution (which you may not need anymore, but I thought I'd throw it out there) is to run xrandr or arandr to switch off the monitor. This would bring all the windows back onto the primary monitor. You could then try using [xa]randr to turn the monitor back on, which might "refresh" the monitor.
Thanks, Giles. I think I've come to an understanding with the BIOS settings. (ThinkPad) Thunderbolt Security Level can be: No Security User Authorization Secure Connect Display Port [sic] and USB If I choose the first two in the BIOS, I can modify the settings in the dedicated Thunderbolt settings panel in Fedora. I can even choose to disable Thunderbolt support in the panel by setting it to DisplayPort and USB. I can't remember how Secure Connect behaved (or why it was unsuitable), but I'll try it again when I get a chance. If I choose the last setting in the BIOS, the Settings panel says "Thunderbolt support has been disabled in the BIOS." As much as I'd like to have options, this seems to be the only setting that permits the external monitor to be recognized when I jiggle the mouse. Even the same setting in Fedora, although it starts with good intentions, forgets after a while and I need to resort to unplugging/replugging. Mike
participants (2)
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Giles Orr -
Michael Hill