Public bug reported:
I have a dual monitor Ubuntu (15.04) setup, running on an NVS 510 (4 DP
outputs), both monitors supporting UHD (3840x2160). Until today, I was
able to use the monitors in their native resolution using Nvidia
propietary drivers - I don't remember the exact version of the drivers,
but they were NOT the latest.
However I received an Ubuntu update (to kernel 3.19.0-30 among others), and I
guess that forced switching to the latest Nvidia propietary driver (346.96).
Now the second monitor no longer reports 3840x2160 as an available resolution,
and checking in the Nvidia settings program I can see that the reported
connection link is 4 lanes @ 2.70 Gbps, instead of the required 5.40 Gbps.
ps. Older kernels (3.19.0-25 for example) no longer work with the Nvidia
driver: booting up results in a 1024x768 resolution login screen, and
login is no longer possible.
** Affects: nvidia-graphics-drivers-346 (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
I have a dual monitor Ubuntu (15.04) setup, running on an NVS 510 (4 DP
outputs), both monitors supporting UHD (3840x2160). Until today, I was
able to use the monitors in their native resolution using Nvidia
propietary drivers - I don't remember the exact version of the drivers,
but they were NOT the latest.
However I received an Ubuntu update (to kernel 3.19.0-30 among others), and I
guess that forced switching to the latest Nvidia propietary driver (346.96).
Now the second monitor no longer reports 3840x2160 as an available
resolution, and checking in the Nvidia settings program I can see that the
reported connection link is 4 lanes @ 2.70 Gbps, instead of the required 5.40
Gbps.
+
+ ps. Older kernels (3.19.0-25 for example) no longer work with the Nvidia
+ driver: booting up results in a 1024x768 resolution login screen, and
+ lgoin is no longer possible.
** Description changed:
I have a dual monitor Ubuntu (15.04) setup, running on an NVS 510 (4 DP
outputs), both monitors supporting UHD (3840x2160). Until today, I was
able to use the monitors in their native resolution using Nvidia
propietary drivers - I don't remember the exact version of the drivers,
but they were NOT the latest.
However I received an Ubuntu update (to kernel 3.19.0-30 among others), and I
guess that forced switching to the latest Nvidia propietary driver (346.96).
Now the second monitor no longer reports 3840x2160 as an available
resolution, and checking in the Nvidia settings program I can see that the
reported connection link is 4 lanes @ 2.70 Gbps, instead of the required 5.40
Gbps.
ps. Older kernels (3.19.0-25 for example) no longer work with the Nvidia
driver: booting up results in a 1024x768 resolution login screen, and
- lgoin is no longer possible.
+ login is no longer possible.
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https://bugs.launchpad.net/bugs/1501245
Title:
Dual UHD resolution is no longer supported
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