Upgraded to kernel 3.16 from Debian Jessie repos. Having performed no firmware upgrade, just upgraded OS. Strange, but problem has gone.
Here's uname output:
$ uname -srvom
Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt7-1 (2015-03-01) x86_64 GNU/Linux
$ cat /etc/issue
Debian GNU/Linux 8
Installation of 3.16 on Debian 7.x still gives that old problem.
Upgraded to kernel 3.16 from Debian Jessie repos. Having performed no firmware upgrade, just upgraded OS. Strange, but problem has gone.
Here's uname output:
$ uname -srvom
Linux 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt7-1 (2015-03-01) x86_64 GNU/Linux
$ cat /etc/issue
Debian GNU/Linux 8
Installation of 3.16 on Debian 7.x still gives that old problem.